Question about HP Pavilion a220n (DK218A#ABA) PC Desktop

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Has led light on but wont turn on

Hp a220n

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This can be due to several things and usually its the last change you made. When you try to turn it on, do you see the fan moving on the power suppy (rear of computer) If this fan is not on I would suspect the powersupply. A power supply can give you a lighton the front and not supply enough power to start the computer.
Next i would remove the cover of the computer (usually two or three phillips screws on the back) and physically inspect all the cables and add-in cards and make sure they are all fully in thier sockets.
If you have added memory recently, a wrong voltage or speed could cause a non-booting system.
check these things and post again if this doesnt help .
These are only a couple steps , but the first steps you should take after trying to boot into safe mode unsuccessfully .
There will be more to check if this does not work, so dont rate untill we solve the issue..

Posted on Oct 21, 2008

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HP desktop power-supply LED lights, but system shuts off/hibernates during...

The "Problem" section below describes a startup problem my 9-year-old HP desktop developed last week. You may be seeing similar behavior in your HP desktop, or even in another brand. The "Solution" section describes a simple fix (cost: ------

Our HP Pavilion a220n tries to start up but turns itself off or sometimes hibernates in the middle of booting up. Although I got it all the way to the login screen once, it then shut off again. It is not stable enough to use or to copy our files over to a new PC.

I've eliminated as causes the power supply and the AC cord. Because sideways pressure on the switch assembly can cause the problem, I assume I need to replace the switch. The faulty power switch is HP Part # 5187-2439 and includes a plunger microswitch, 2 LEDs, 12" cable and motherboard connector. The power switch assembly doesn't seem to be available from HP or third-party sources after 8-9 years -- big surprise!

The FixYa suggested solution with 2x5 motherboard pinouts is the beginning of a solution to my specific problem. Those pinouts do match the pinouts for my switch assembly. If generic power switch assemblies matching this pinout had been available, replacing the assembly would have solved my problem.

SOLVED by replacing a noisy power-on/off pushbutton. Of course, you should observe all typical precautions to avoid electric shock to yourself or static discharge to PC internal circuit elements. Wearing a grounded wrist strap and touching the chassis metal to a grounded lead will help with this.

To start, you must remove the "bezel" (front panel) from the chassis after removing both side panels. Instructions for doing this are embossed on the plastic mounting flanges, and you can also access online instructions at the HP site. There's a small (about 1" by 2") plastic housing for the power switch, power-on LED, and disk-access LED, that you pop out from the chassis, making the switch contents accessible.

For convenience, I unplugged the 2-by-5 plug from the motherboard and worked on the switch assembly outside the chassis. To thread the plug and cabling out of the chassis requires removing the hard drive from its mounting bracket (no screws) and the mounting bracket itself (two screws). You may be able to do the repair without this step.

Then I verified with an ohmmeter that the original pushbutton was a single-pole, single-throw, normally open (SPST, NO) momentary switch, which closes the contact only as long as it is pushed in. It really had to be that type, considering that the switch has just two wires coming off it, and that depressing and holding the pushbutton has a different function from depressing and immediately releasing it. Checking with an ohmmeter also allowed me to verify that the switch was noisy (it intermittently closed when the plunger or housing was laterally stressed). These intermittent closures were causing the spurious hibernate events.

I bought an inexpensive replacement switch of the same type (in mini-pushbutton size, part 275-1547) at the local Radio Shack. As of today (6/16/2012) it is listed online at "". Although the online site says it is rated at 0.5 A, the package says 3.0 A at 125 V. Any other similar switch would do as well.

In my HP model (HP Pavilion a220n), the pushbutton lives in a square hole in the 1" by 2" switch/LED mounting piece mentioned above. It is easily poked out with a pointed soldering tool or nut pick. I unsoldered the red/black wire pair and soldered them to the new switch. The small size of the mini-pushbutton allowed it to fit partway through the 1" by 2" switch/LED mounting piece. That allowed me to remount the front panel to the chassis (minus the round power-on/off cap with the power logo on it -- which was broken in my case anyway), leaving the pushbutton available for use.

on Jun 17, 2012 | HP Computers & Internet

1 Answer

My laptop wont turn back on. when i hit the power button the lighting bolt icon in the bottom corner with flash but it wont turn on. How can i get it to turn back on??

Are your LED's coming on like it is trying to read your hard drive? There should be an LED for power on, one for charging, one will blink when the hard drive is reading, etc. Are any of these working?

Feb 08, 2012 | HP Computers & Internet

1 Answer

My "hp pavilion a220n" won't power on. ... I was

Pull the power cord out and press the power button on the PC to drain the power for 10 seconds. Then plug the power cord back in and turn the computer on. If still does not work, then the power supply may be blown out and needs replacement.

Dec 23, 2010 | HP Pavilion a220n (DK218A#ABA) PC Desktop

1 Answer

My "hp pavilion a220n" won't

Check all wires for loose connections--- if the memory was wrong or something, it would still attempt to boot but stop during the POST and start to beep

Dec 23, 2010 | HP Pavilion a220n (DK218A#ABA) PC Desktop

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Hp desktop power wont turn on

When you powered it on, does the power supply fan spinning? If not, then you might need to change the power supply. It may got the led light lit on, but it does not have enough power to turn on the entire computer.

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Hp Pavillion Tx1320us..wont boot up

You're probably one of thousands of victims of defective nvidia chipsets in these systems. Call HP and complain.

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Installing Windows XP on new drive in HP a220n

Your new hard drive has a name, like Seagate, Western Digtail, bla, bla... Go to the Mfg's web site for your drive. Download the bootable floppy disk manager setup utilities. If you have a floppy disk drive. If you don't have a floppy drive most Mfg's allow you to make a bootable CD. Lastly or maybe I should have mentioned this first. Make sure your drive is pinned out correctly. I'm only guessing you bought an IDE drive which has a jumper for setting the drive as a master or a slave or a master with a slave.

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POST Beeps.

HP Beep codes are listed here: None of them matches your description, so listen again and see if the pattern matches any described by HP. Have you tried the monitor on another computer? Did you connect to the onboard graphics connector? Look for any loose components, especially memory.

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